/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

let grade = 'B';
switch (grade) {
    case 'A':
        console.log('Excellent!');
        break;
    case 'B':
        console.log('Well done!');
        break;
    case 'C':
        console.log('Average performance.');
        break;
    case 'D':
        console.log('Below average.');
        break;
    case 'F':
        console.log('Failed.');
        break;
    default:
        console.log('Invalid grade.');
}